钙钛矿型氧化物由于其晶体结构的独特性及性能的优异性,有望成为新型的氧还原催化剂。以硫酸锰和硝酸锌为原料,碳酸钠为沉淀剂,通过共沉淀法制备Zn-Mn前驱体。经高温煅烧4h,制备出单一形貌的球形钙钛矿型晶体结构ZnMnO3。随后以Sn(NO3)2为锡源,制备了不同Sn含量的掺杂ZnMnO3。对制备的样品进行电化学测试,研究了Sn含量对球型ZnMnO3电化学性能的影响。结果表明:当Sn掺杂量为7%时ZnMnO3的导电性和耐腐蚀性皆有所提升,且将其用作铝-空气电池的空气电极催化剂时,在20mA/cm2、40mA/cm2、60mA/cm2、80mA/cm2、100mA/cm2和120mA/cm2的放电电流密度下测试放电性能,放电电压为1.43V、1.35V、1.25V、1.05V、0.89V、0.75V,与其他掺杂量相比7% Sn掺杂量的ZnMnO3放电性能最为优异,在空气电极应用上有广阔前景。
Perovskite-type oxides are expected to be a new type of oxygen reduction catalyst due to their unique crystal structure and excellent performance.Manganese sulfate and zinc nitrate were used as raw materials,sodium carbonate as precipitant,Zn-Mn precursor was prepared by coprecipitation method.After high temperature calcination for 4h,a single morphology spherical perovskite crystal structure ZnMnO3 was prepared.Subsequently,Sn(NO3)2 was used as the tin source to prepare ZnMnO3 with different Sn content.Electrochemical tests were carried out on the prepared samples,and the influence of Sn content on the electrochemical performance of spherical ZnMnO3 was studied.The results shown that the conductivity and corrosion resistance of ZnMnO3 were improved when the doping amount of Sn was 7%.When it was used as the air electrode catalyst of Al-air battery,the discharge performance was tested at the discharge current density of 20mA/cm2,40mA/cm2,60mA/cm2,80mA/cm2,100mA/cm2 and 120mA/cm2.The discharge voltages were 1.43V,1.35V,1.25V,1.05V,0.89V and 0.75V,respectively.Compared with other doping amounts,ZnMnO3 with 7% Sn had the most excellent discharge performance,and broad prospects for air electrode applications.
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